Answers for "get_terms by post id"

wordpress get taxonomy of a post

<?php $term_obj_list = get_the_terms( $post->ID, 'taxonomy_name' ); ?>

woocommerce get post terms product

$term_obj_list = get_the_terms( $post->ID, 'taxonomy' );
$terms_string = join(', ', wp_list_pluck($term_obj_list, 'name'));

get term id by post id

INSIDE TAXONOMY PAGES
$term      = get_queried_object();
$term_id   = $term->term_id;